| Seymour to Olympia (Washington) | 1,931.72 mi (3,108.81 km) |
| Seymour to Olympia Heights (Florida) | 968.91 mi (1,559.31 km) |
| Seymour to Omaha (Nebraska) | 559.95 mi (901.15 km) |
| Seymour to On Top of the World Designated Place (Florida) | 710.46 mi (1,143.37 km) |
| Seymour to Onalaska (Wisconsin) | 438.44 mi (705.60 km) |
| Seymour to Oneida (New York) | 604.21 mi (972.38 km) |
| Seymour to Oneonta (New York) | 616.02 mi (991.40 km) |
| Seymour to Ontario (California) | 1,784.63 mi (2,872.09 km) |
| Seymour to Ontario (Oregon) | 1,636.40 mi (2,633.54 km) |
| Seymour to Opa-locka (Florida) | 959.02 mi (1,543.40 km) |
| Seymour to Opelika (Alabama) | 435.30 mi (700.55 km) |
| Seymour to Opelousas (Louisiana) | 679.42 mi (1,093.42 km) |
| Seymour to Orange (California) | 1,801.89 mi (2,899.86 km) |
| Seymour to Orange (Texas) | 755.88 mi (1,216.48 km) |
| Seymour to Orange City (Florida) | 740.13 mi (1,191.13 km) |
